Final answer:
When solving for an unknown variable in mathematics, simplification and rearrangement of the equation are common steps, which can vary depending on equation complexity.
Step-by-step explanation:
Based on the snippets of information provided, it appears the student is dealing with equations related to mathematics, potentially encompassing subjects such as algebra, calculus, or statistics. For example, calculating z-scores relates to statistical analysis, involving standard deviations and means. When you have an equation with one unknown, the process usually includes simplifying the equation, then rearranging the equation to solve for x. Should the equation be more complex, such as a degree three equation, alternative methods like using graphing calculators might be warranted. It is crucial to remember that mathematical problems can often be approached in multiple ways, leading to the same solution, which provides a means of verification.